Hi 350Z,
It all depends on how soon you want to start an integrated course.Obviously doing some further flight training is helpful with both any integrated course assessments as well seeing whether you enjoy/ have the basic ability to fly.
Im off to NZ with CTC shortly and have had a PPL for 4 years. The PPL has been brilliant fun and helped massively with the interview stage for CTC (proving my determination etc), but quite simply its down to you and your current situation and isnt particularly neccessary